The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The art studio of an early 20th-century painter, hidden amid the Great Smoky Mountains.

The world's largest set of the ten commandments lay nestled in the heart of the Great Smoky Mountains.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

Mile-long cave system near Great Smoky Mountains.

This building contains handprints that are well over a century old.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This stone memorial pays tribute to a massive shipwreck which was sadly overshadowed by the death of John Wilkes Booth.

This museum pays tribute to the Cherokee leader who created a written language for his people.

The secret city built by the Manhattan Project.

Enormous lake at the bottom of a unique cave system.